I see the full picture now. Tesla's numbers are not EPA tests but their own number of 'ideal miles' which is 55mph cruising, probably with a small amount of reserve power. EPA tests until the car is dead.

If Tom Sax's number of 85 miles is correct for the Leaf as equivalent to how the Roadster is measured, then the percentage to subtract would be about 14% (0.86x), so the Roadster would have about 210. (Which I think is about the value used in the UK). That might be a bit different for the Model S, but in case a similar number would be used, it would be about 260 miles. (There was also talk the range might be slightly more than 300 miles by its current measurement: @55mph). That would be much more than the 210 in the table above.

Whatever the EPA says the range is, I hope Tesla advertises something closer to what most of their customers will get or qualify it with the @55 mph statement. Providing a link to a webpage with that mileage estimator they had at the event would be great. Be as transparent as possible when it comes to range, something a traditional manufacturer doesn't have to do as filling up at a gas station takes care of any range issues.

I looked at this graph, and some derived from that graph, my driving habits and the EPA numbers on my car. I am expecting 112/168/210 ranges with their batteries. That is Highway at 80mph, AC, and a few 0-40mph at stop lights.

I expect I could stretch the mileage to the Tesla numbers fairly easily. Driving 50-60 on the interstate, gentle starting, and as much regen as I can manage.

I basically took Tesla's numbers and multiplied by .7. It helped that the Leaf's real world vs. their stated range was roughly this ratio also.